单项选择题

Which of the following factors was ultimately responsible for bringing down the civilization of ancient Egypt

A．Change of climate.
B．Corruption.
C．Flood.
D．Population growth.
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单项选择题
According to Krom, the Egypt's Old Kingdom fell
A．immediately after a period of drought.
B．immediately after a period of flood.
C．just before a drought struck.
D．just before a flood struck.
单项选择题
Which of the following statements is true
A．The White Nile is the trunk of the River Nile.
B．The White Nile is the trunk of the Blue Nile. '
C．The White Nile is a branch of the Blue Nile.
D．The White Nile is a branch of the River Nile.
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